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If gall bladder stone
remain asymptomatic then there is no need of surgery.
Her weakness may be due diabetes or its complication like diabetic neuropathy
Weakness with sudden fall of blood pressure is a feature of autonomic neuropathy which is also a feature of diabetes.
Alteration of bowel habit may occur due to same problem.
Though there is possibility of irritable bowel syndrome
or non ulcer dyspepsia.
So all complication of diabetes should be excluded.
Physical examination & some relevation investigation are all to exclude these.